Tìm công thức sai:
A.
.
![C:\Users\Admin\AppData\Local\Temp\ksohtml7116\wps33.png](https://cungthi.online/upload/questionbank3_20201220/eduquestion/202021125164337774721/image202021125164337774721629281_images/image202021125164337774721629281_img1.png)
B.
.
![C:\Users\Admin\AppData\Local\Temp\ksohtml7116\wps34.png](https://cungthi.online/upload/questionbank3_20201220/eduquestion/202021125164337774721/image202021125164337774721948218_images/image202021125164337774721948218_img1.png)
C.
.
![C:\Users\Admin\AppData\Local\Temp\ksohtml7116\wps35.png](https://cungthi.online/upload/questionbank3_20201220/eduquestion/202021125164337774721/image202021125164337774721378268_images/image202021125164337774721378268_img1.png)
D.
.
![C:\Users\Admin\AppData\Local\Temp\ksohtml7116\wps36.png](https://cungthi.online/upload/questionbank3_20201220/eduquestion/202021125164337774721/image202021125164337774721232828_images/image202021125164337774721232828_img1.png)
Đáp án và lời giải
Đáp án:C